163977 has 8 divisors (see below), whose sum is σ = 238560. Its totient is φ = 99360.

The previous prime is 163973. The next prime is 163979. The reversal of 163977 is 779361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163977 - 2² = 163973 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4969 = 163977 / (1 + 6 + 3 + 9 + 7 + 7).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (163973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2452 + ... + 2517.

It is an arithmetic number, because the mean of its divisors is an integer number (29820).

2¹⁶³⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

163977 is a deficient number, since it is larger than the sum of its proper divisors (74583).

163977 is a wasteful number, since it uses less digits than its factorization.

163977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4983.

The product of its digits is 7938, while the sum is 33.

The square root of 163977 is about 404.9407364047. The cubic root of 163977 is about 54.7344777831.

It can be divided in two parts, 16 and 3977, that added together give a palindrome (3993).

The spelling of 163977 in words is "one hundred sixty-three thousand, nine hundred seventy-seven".